Energy saving bulb



FIG. 1 is a front view of an energy saving bulb of the present invention;

FIG. 2 is a rear view thereof;

FIG. 3 is a first side view thereof;

FIG. 4 is a second side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken line disclosure of the lamp base and some parts within the outer envelope is for illustrative purposes only and forms no part of the claimed design. 

I claim the ornamental design for an energy saving bulb, as shown and described. 